Fix yaml indentation for Action Runner Controller Docs

[zhuoyang]

Why:

Resources limits and requests must be set at container level instead of pod level, and securityContext is invalid under resources
Closes:

What's being changed (if available, include any code snippets, screenshots, or gifs):

Fix indentation of the resources

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The table contains an overview of files in the content directory that have been changed in this pull request. It's provided to make it easy to review your changes on the staging site. Please note that changes to the data directory will not show up in this table.

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Content directory changes

You may find it useful to copy this table into the pull request summary. There you can edit it to share links to important articles or changes and to give a high-level overview of how the changes in your pull request support the overall goals of the pull request.

Source	Preview	Production	What Changed
actions/hosting-your-own-runners/managing-self-hosted-runners-with-actions-runner-controller/deploying-runner-scale-sets-with-actions-runner-controller.md	fpt ghec ghes@ 3.10 3.9	fpt ghec ghes@ 3.10 3.9

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fpt: Free, Pro, Team
ghec: GitHub Enterprise Cloud
ghes: GitHub Enterprise Server
ghae: GitHub AE

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Thank you for this fix! ✨

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